Ford Repair: 1991 FORD F150 INTAKE SWAP, ford gt40, vacuum leak

Question
IN MY 91 F150 WITH THE 5.0 I RECENTLY GOT A VACUUM LEAK IN THE GASKET WHICH MATES THE UPPER TO THE LOWER.
QUESTIONS .I HAVE A CHANCE TO GET A UPPER AND LOWER MANIFOLD OFF A 87 GT .ANY MAJOR MODS OR IS IT BOLT ON AND GO  

Answer
Mark-

  Actually, it won't work at all.  The inlet for the intake on a Mustang intake faces the oppostie direction when compared to a truck intake (passenger side for the Mustang, driver's side for the truck).  The only EFI intake that can be swapped between Mustangs and trucks is the Ford GT40 manifold simply because of it's symmetrical design.  Hope this helps.

Steve